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Free lime in clinker indicates that

  • A.burning or mixing has been incomplete
  • B.the clinker has been cooled too rapidly
  • C.too much gypsum has been added
  • D.the cement will set unusually slowly

Answer: A

Either the meal was too coarse, the mix too high in lime, or the burning too short or too cool. It is measured routinely because it is the most direct indicator of how well the kiln is doing its work. A rising figure is usually the first sign that burning has slipped.

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